吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (5): 1331-1337.doi: 10.13229/j.cnki.jdxbgxb.20210880

• 材料科学与工程 • 上一篇    

铝/钢等离子弧熔⁃钎焊接头界面电子背散射衍射分析

吴迪1,2(),耿文华1,3,李洪梅1(),孙大千1   

  1. 1.吉林大学 材料科学与工程学院，长春 130022
    2.长春师范大学 工程学院，长春 130031
    3.一汽-大众汽车有限公司 天津分公司，天津 301599
  • 收稿日期:2021-09-07 出版日期:2023-05-01 发布日期:2023-05-25
  • 通讯作者: 李洪梅 E-mail:wdi15@mails.jlu.edu.cn;lihongmei0511@126.com
  • 作者简介:吴迪（1987-），女，讲师，博士研究生.研究方向：等离子弧焊工艺.E-mail：wdi15@mails.jlu.edu.cn
  • 基金资助:
    国家自然科学基金项目(51805205);吉林省科技发展计划项目(YDZJ202201ZYTS548);长春师范大学自然科学基金项目(［2018］005)

Electron backscattered diffraction analysis on interface of aluminum/steel joints produced by plasma arc welding⁃brazing

Di WU1,2(),Wen-hua GENG1,3,Hong-mei LI1(),Da-qian SUN1   

  1. 1.College of Materials Science and Engineering，Jilin University，Changchun 130022，China
    2.College of Engineering，Changchun Normal University，Changchun 130031，China
    3.Tianjin Branch FAW-VW Automation Limited Company，Tianjin 301599，China
  • Received:2021-09-07 Online:2023-05-01 Published:2023-05-25
  • Contact: Hong-mei LI E-mail:wdi15@mails.jlu.edu.cn;lihongmei0511@126.com

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摘要：

采用电子背散射衍射（EBSD）技术对铝合金/超高强钢等离子弧熔-钎焊接头界面的组织构成、晶粒取向和取向差分布、晶粒尺寸、织构情况进行了研究。结果表明：铝合金/超高强钢等离子弧熔-钎焊接头界面组织呈明显的双层结构，由Fe4Al13相和Fe2Al5相组成，两相在晶粒尺寸和形态上存在明显差异。Fe4Al13相呈细小的等轴晶形态，以大角度晶界为主，Fe2Al5相呈柱状晶形态，以小角度晶界为主。Fe4Al13相的晶粒尺寸明显小于Fe2Al5相晶粒尺寸。Fe4Al13相的主要织构为<010>丝织构，Fe2Al5相晶粒具有明显的择优取向，其主要织构为 <001>丝织构。

关键词: 金属材料, 铝合金/超高强钢, 等离子弧熔-钎焊, 界面组织, 织构, 电子背散射衍射

Abstract:

The technique electron backscatter diffraction was used to investigate the microstructure， grain orientation， grain size and texture of the interface intermetallic compound of aluminum alloy/ultrahigh-strength steel plasma arc welding-brazing joint. The results indicated that the interface zone exhibited an obvious double-layer structure with different sizes and morphologies， which is composed of Fe4Al13 phase and Fe2Al5 phase. The Fe4Al13 phase has fine equiaxed grains morphology and is dominated by high-angle one， while the Fe2Al5 phase has columnar grains morphology and is dominated by low-angle grain boundary. The grain size of Fe4Al13 is obviously smaller than that of Fe2Al5. The main texture of Fe4Al13 phase is <010> silk texture， while the main texture of Fe2Al5 phase is <001> silk texture with obvious preferred orientation.

Key words: metallic materials, aluminum alloy/ultrahigh-strength steel, plasma arc welding-brazing, microstructure of interface, texture, electron backscattered diffraction

中图分类号: 

  • TG456.2

表1

5A06铝合金的化学成分"

元素质量分数元素质量分数
Si0.17Fe0.21
Mn0.72Zn0.05
Mg6.25Ti0.04
Cu0.04AlBal

表2

DP1180超高强钢的化学成分"

元素质量分数元素质量分数
C0.18S0.010
Mn3.00P0.038
Si0.16FeBal

表3

5A06铝合金和DP1180超高强钢的力学性能"

母 材屈服强度 /MPa抗拉强度 /MPa伸长率/%
5A06 铝合金16035016
DP1180超高强钢85012007

图1

等离子弧焊接示意图"

表4

等离子弧焊接工艺参数"

参 数数值
焊接电流/A90
焊接速度/（mm·min-1）280
送丝速度/（mm·min-1）300
等离子气体流量/（L·min-1）2
保护气流量/（L·min-1）20
喷嘴与工件距离/mm3~4

图2

界面区微观组织"

图3

界面区EBSD相分布图"

图4

界面区晶粒取向分布图"

图5

界面区晶粒取向差分布图"

图6

界面区晶粒尺寸分布"

图7

界面区｛100｝｛010｝｛001｝极图"

图8

界面区施密特因子分布图"

图9

界面区施密特因子数值统计"

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